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提出了一种利用全光纤非平衡Mach Zehnder干涉仪作为边缘滤波器进行光纤布拉格光栅 (FBG)波长移位检测的方案。这种边沿滤波器具有梳状的滤波特性 ,且其两输出臂滤波特性互补。利用其一对滤波边沿 ,可以将被测光栅的波长信息转化为功率信息进行检测。在制作时 ,通过适当改变干涉臂长差可方便地调整测量范围和检测分辨率 ,具有较大的灵活性。以两种不同的比较运算的方法消除系统功率起伏对测量结果的影响 ,都得到了较好的结果。采用该检测方案进行了光纤布拉格光栅温度传感实验 ,得到了± 10 pm的波长测量精度。
A scheme to detect the wavelength shift of fiber Bragg grating (FBG) by using an all-fiber unbalanced Mach Zehnder interferometer as an edge filter is proposed. This edge filter has comb filter characteristics, and its output filter characteristics of the two complementary. With a pair of filter edges, the wavelength information of the grating under test can be converted into power information for detection. In production, by appropriately changing the length of the interference arm can easily adjust the measurement range and detection resolution, with greater flexibility. Two different comparison methods to eliminate the system power fluctuations on the measurement results, have been better results. The fiber Bragg grating temperature sensing experiment was carried out by using this scheme and the wavelength measurement accuracy of ± 10 pm was obtained.